I'm looking for some bl manga where the uke/seme decides to give up the uke/seme for some circumstances (like unrequited love or sex-friends position etc) and of course the uke/seme plans to disappear or something and the partner realizes his feelings.

Its okay als if they were in a relationship (complicated relationship) and then break-off but then gets reunited.

Something like Higouhou Junai?

Others that might fit:
Aishuu
Utsukushiki Kemonotachi. sex friends then uke tries to leave to study abroad
Touch Blue- uke leaves later on more like the second scenario where they were in a relationship already

I already read aishuu so I'll read you other recs!

Ahhhhhh I wanttt moreee~